<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h2>sessionStorage</h2>
    <button onclick="saveData()">点我保存一个数据</button>
    <button onclick="readData()">点我读取一个数据</button>
    <button onclick="deleteData()">点我删除一个数据</button>
    <button onclick="deleteAllData()">点我清空所有数据</button>

    <script>
        let p = {name: '张三', age: 18}
        function saveData(){
            sessionStorage.setItem('msg', 'hello!')
            sessionStorage.setItem('msg2', 666)
            sessionStorage.setItem('person', JSON.stringify(p))
        }
        function readData(){
            console.log(sessionStorage.getItem('msg2'));
            console.log(sessionStorage.getItem('msg'));

            const result = sessionStorage.getItem('person')
            console.log(JSON.parse(result));
        }
        function deleteData(){
            sessionStorage.removeItem('msg2')

        }
        function deleteAllData(){
            sessionStorage.clear()
        }
    </script>
</body>
</html>